<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title></title>
	<style type="text/css">
		.box{
			width: 1200px;
			height: 600px;
			background: aquamarine;
			display: flex;
			align-items: center;
		}
		.box div{
			width: 200px;
			height: 100px;
			margin: 10px;
			background: pink;
		}
		.box div:nth-child(5){
			/*	作用于单个子元素 和align-items没有区别		*/
			align-self: flex-end;
		}
	</style>
</head>
<body>
	<div class="box">
	<div>1</div>
	<div>2</div>
	<div>3</div>
	<div>4</div>
	<div>5</div>
	<div>6</div>
	<div>7</div>
	<div>8</div>
	<div>9</div>
	</div>

</body>
</html>